1.3 3.5 5.7 x x ( 2) 1990
1 1 1 1 1 1 1 1989
1 3 3 5 5 7 x x 2 1990
1 1989
1 x 2 1990
x x x
1990( 1) 1989( 2)
x
2 1990
1990 x 1989 x 1989.2 1990 x 1988
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